THE TWO TYPES. 



145 



internode of axis, and one or more leaves (bracts) at each node, 

 and then a flower in the axil of each bract, until its strength or 

 capability is exhausted. Or it may stop short with very few 

 flowers ; but the uppermost and youngest one will not really ter- 



278 279 280 



minate the rhachis (i. e. come from a terminal bud) , though it 

 may appear to do so. (Fig. 272, 277-279, &c.) The lower 

 flower-buds are evidently the oldest, and accordingly the first to 

 expand ; and the expansion will proceed regularly from below 

 upward : wherefore this t}'pe of inflorescence has been called the 

 Ascending or Acropetal ; likewise the Centripetal, because, when 

 the flowers are brought to the same level or near it (as in Fig. 

 279, 280) by a lengthening of the lower pedicels, with or with- 

 out relative shortening of the rhachis, the evolution 

 is seen to proceed from circumference to centre. 

 There is thus no lack of names ; but, inasmuch as 

 the following t}-pe is commonly referred to under the 

 general name of Cymose, to this has recently been 

 given the counterpart name of Botryose. (271.) 



\\ \ 



281 282 283 284 



270. A determinate flower-cluster (as seen in its gradual 

 development which is not rarely presented) has the last internode 



FIG. 278-2X0 Diagrams of indefinite, indeterminate, centripetal, or botryose in- 

 florescence : 278, Raceme ; 279, Corymb ; 280, Umbel. 



FIG. 2S1-284 Diagrams of definite, determinate, centrifugal, or cyniose inflores- 

 cence: 281, a false or descending raceme; 282, a solitary terminal flower; 283, sanu- with 

 two lateral flowers developing, forming a 3-flowered cyme; 284, same with lateral 

 peduncles 3-flowered, or a pair of 3-flowered cymes, beside the central or primary 

 terminal flower. 



